Connecting To Plcs And Other Devices - Omron 3G3MX2 User Manual

Connecting to PLCs and Other Devices

4-2 Connecting to PLCs and Other Devices
!Caution It is possible to damage the inverter or other devices if your application
Omron inverters (drives) are useful in many types of applications. During
installation, the inverter keypad (or other programming device) will facilitate
the initial configuration. After installation, the inverter will generally receive its
control commands through the control logic connector or serial interface from
another controlling device. In a simple application such as single-conveyor
speed control, a Run/Stop switch and potentiometer will give the operator all
the required control. In a sophisticated application, you may have a program-
mable logic controller (PLC) as the system controller, with several connections
to the inverter.
It is not possible to cover all the possible types of application in this manual. It
will be necessary for you to know the electrical characteristics of the devices
you want to connect to the inverter. Then, this section and the following sec-
tions on I/O terminal functions can help you quickly and safely connect those
devices to the inverter.
exceeds the maximum current or voltage characteristics of a connection point.
The connections between the
inverter and other devices rely
on the electrical input/output
characteristics at both ends of
each connection, shown in the
diagram to the right.
inverter's configurable
accept either a sourcing or sink-
ing output from an external
device (such as PLC). This
chapter shows the inverter's
internal electrical component(s)
at each I/O terminal. In some
cases, you will need to insert a
power source in the interface
wiring.
In order to avoid equipment
damage and get your application
running smoothly, we recom-
mend drawing a schematic of
each connection between the
inverter and the other device.
Include the internal components
of each device in the schematic,
so that it makes a complete cir-
cuit loop.
After making the schematic, then:
1. Verify that the current and voltage for each connection is within the oper-
ating limits of each device.
2. Make sure that the logic sense (active high or active low) of any ON/OFF
connection is correct.
3. Check the zero and span (curve end points) for analog connections, and
be sure the scale factor from input to output is correct.
4. Understand what will happen at the system level if any particular device
suddenly loses power, or powers up after other devices.
Other device
Input
circuit
Output
The
circuit
inputs
Other device
GND
Section 4-2
MX2 inverter
signal
Output
return
circuit
signal
Input
return
circuit
MX2 inverter
24 V
+ -
P24
1
2
Input
circuits
3
7
L
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